Self-opening die



0.;A. SORENSEN. SELFOPENING DIE.

' APPLICATION FILED OCT. 16. I918. 1,351,447. j Patented Aug- 31, 1920.

2 SHEETS-SHEET I 0. A. SORENSEN.

SELF OPENING DIE.

APPLICATION FILED 00116. 1918.

1,351,447, I PatntedAug. 31,1920.

2 SHEETS-SHEET 2- luveu Md. M

7 operation, to permit quickretraction of the o'r'ro etsonnivsniv, or NEW-YORK,

T SELF-OPENING DIE.

' a lication filedpctober. 16, ,1918} sci-min 258,356.

' work.

The objects of the inventionare to prov de a quick acting (116, of this character, of simple and substantial constructlon, which will" consist of but few, sturdy parts and which will be relatively inexpensive of pro duction. 1

I; further and special object in my inven tion, is to eliminate the need for special dies or cutters and to enable the use in the device of standard cutters nov on the market. a

Briefly, the invention, in the form herein disclosed, consists of a pair, of cutter jaws pivoted between the sides of a bifurcated supporting head, said jaws being engaged at their inner ends by a jaw' closer slidingly mounted in the head and in; the plane of the work, so as to beoperatecl-thereby to release the aws. Means are provided for shifting said aw closer in the reverse, direction to close the jaws. The jaws at their outer, ends are provided with seats for the cutters or die segments and with means for detachably securing the cutters in place.v

Other features'o f the invention will ap pear as the specification proceeds.

'In the accompanying drawings I have illustratedthe invention embodied in a; sini ple, practical form,- butwit will be understood that various [changes and modifications may bemade without departing from the true spirit and scopelof the invention.

Insaid drawings ,Figures l and 2 are side and edge views of the device; Fig. .3 is an end view of the same; Fig. 4c is a longitudi nal sectional I view, taken substantially on the plane'of line of Fig. 2, showingthe jaws in the opened position, Fig. 5 is an illustration of an application of the invention to aturret lathe; Fig; 6 is a plan view of a commercial or standard type of one- -Spcc ification of Letters Patent. Patented The body j a supporting head 8, forked or bifurcated to prov de the spaced.sides9, and provided tion. j H of the device is .in the form of Aug. 31, 1920.

I piece Fig. isga view I'of the same spli tin two segmentsfor'use in; my inven at the rear with-a suitable arbor or spindle 0 for engagement in a lathe, drill press,

or other machine.

Thecocperating cutter jaws 'are designated 11," and are shown pivoted interme) diate their ends on pivot studs 12, between" the forked sidesof the, head;

The'cutters proper are illustratedassepa rately formed substantially semi-cylindrical die segiiients l3, engaged in substantially semi-cylindrical seats 141 formed in the' outer ends of the jaws, said seats being open to the outer endsof the jaws and thesegments i being shownas securedtherein by the over;- lying end or cover plates 1'5" and the edge engaging plates 16. The end clampplates' are shown held by screws l7 and "the edge clamps by the nuts 18,1whichenables-the cutter segments being readily removedand replaced and further provides for taking up any wear to clamp the cutters firmly; inplace.

The jaw closer comprisesin-thefpresent illustration, a wedge block 19., slidably mounted on the stud 20, at the inner end, of the jaws and provided withthe outer relatively low abu-tment surfaces 2l, connected by inclines or cams 22 WithEthe higherabut ment surfaces 23; In the, opened condition 9o 'ofthe jaws the inner ends of: the jaws, a.

which may be providedwith the hardened bearing surfaces 24gbearfon thelower or re duced portions of the wedge block as shown in Fig. 4, and -whenfthe Wedgeblock is advanced, the cam shoulders .22,- act I to, spread or separate the inner endsof the jaws, thereby closin'g'orv bringing together the forward ends 'ofthejjawsas shown in. I00 1 Fig. 1. In the final closed positionof the jaws, the inner endsof the, jaws bear on the upper or raisedportions 23 ofthe wedge, blocks which serve to .hold the jaws firmly closed. As the wedge'bilock is retr'acted, the flat springs 25, bearing on theinner; ends of the jaws, rock the j aws' toj open position and oausethe jaws to closely follow the wedge surfaces.

-The' automatic opening of the die is acv complished by causing thework, as it ad vances, relatively, in the die, to engage and pushback the wedge block. The block is,

for this purpose, provided at its outer or for- 'ward end with an abutment'26, disposedin the path of the work and shown as a hollow thimble screwed on the'threaded end portion 27 of the block. The adjustment of this abutment thimble enables the settingofthe die for longer or shorter work and to retain the thimble in the position to which it is adjusted, I have shown a flat spring28, carried by theblock and bearing on one of the flattened sides ofthe thimble. I The thimble may have a slot 29 cut in the end thereof to receive 'a screw driver or like instruinent to enable the adjustment of the abutmentfrom the open'endof the die. I

The die may be-closed automatically, .or by han d, as desired. InFig. 1 I have indicatedin dotted lines, a handle 30 adaptedfor manual operation, pivoted on the head at 31 and connected with a stud or pin 32, projecting transversely from the slide. This studis shown as working in longitudinal slots 33 in the sides of the head, which limit the stroke or movement of the slide.

Fig. 5 illustrates one application of the invention toa turret lathe, wherein the dies are carried by, the turret 34 and the work 35 is carried by a chuck 36 on the head stock of the lathe. In this case the dies are automatically closed by a cam 87 which engages the outstanding pins 82 to project the slides and close the aws,as the dies swing around in the shifting of the turret.

In Figs. 6and 7,1 have illustrated how I may take an ordinaryone piece die 38 of standard, commercial construction and split the same apart into two segments 13, to fit in the, seats provided therefor in the jaws.

The operation of the device, it will be seen, is simple and positive, the dies are readily interchangeable and the device is capable of usingordinary dies now on the market. A further important advantage is that the device consists of but few, simple parts which require but little machine work,

so that the .die can be simply and inexpen sively manufactured. Bysubstituting dif ferent kinds. of cutters, the various operations of'cu ttingscrew threads, milling, etc.,

can all be performed.

1 claim:

l. A self-opening die comprising a supporting head, cooperating jaws pivoted in said head, cutters carried by said jaws, a stud rigidly'secured to thehead and centrally projecting therefrom between the rear ends of the pivotejdjaws, jaw closer slidingly mounted on the stud'in position to be tripped by the work to release the aws and means for sliding said jaw closer in the reverse direction to "close the aws.

2. A self-opening die comprising a supporting head, QOiiperating jaws pivoted. in said head, cutters carried by said jaws, a centrally extending stud rigidly secured to the head and projecting between the pivoted jaws at the rear ends thereof, a jaw closer wedge block between the [inner ends of the jaws and an abutmenton said wje dge block eXtension in po sition to be engagefd by the work. Y I r r 4. A combinationdike that set ,forth in claim 4, whereinthe abutment, is longitudinally adjustable on the: wedge block ext ent sion and means are provided toiyr'e taining d i meilti dju te P SifiQD- 5. A combination like that set forthin claim 4, wherein the, jaws are provided with seats intheir forward' enc ls i'or cutters of standard design, andmeans are provided for engagingthe ends and one side of the cutters for detachably securing such cutters in said seats. 1 p p 6. In combinatiomabifurcated headhaving longitudinalhslots in,thesides thereof,- jaws pivotedbetween the sides ofsaidhead,

a longitudinal stud in the head at the inner 7 ends of the jaws, a wedgeblock slidingly engaged on saidstudfor spreading the inner ends of the jaws, a transverse pinon the wedge blockoperatingin the longitudinal slots in the sides of the heachan adjustable abutment on the wedge block in position to be engaged by the work, the jaws having cutter seats in their outerjends, cutters ,en-

gaged in said seatsjand meansfor detachably securlng saidcutters 1n such seats. v,

7. A comb nat on likeothat set forth in claim 4, wherein the j awsareprovidedwith opposed substantially .semi-cylindrical seats in their forward ends, the cuttersare in the form of substantially semi-cylindrical segments to fit in said-seats andside clamps are provided one on each side of the ja ws' for engaging opposite edges of the segmentsjto hold them in their. seats,

In'testi o ny 1 herOfI affix my signature.

. OTTO A SQRENSEN," 

